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Photoinduced Phase Transition in Pr_{0.5}Ca_{0.5}CoO_3 Studied by Sequential Pulse Excitations

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Seko K., Okimoto Y., Kurashima M., Fukaya R., Egawa T., Ishikawa T., Onda K., Koshihara S., Kyomen T., Itoh M.

Acta Physica Polonica A

2012

vol. 121

issue 2

369-371

A perovskite-type cobalt oxide, Pr_{0.5}Ca_{0.5}CoO_3 (PCCO), shows photoinduced phase transition. In this study, we successively irradiated two laser pulses with different intensities to PCCO and probed the transient change of the reflection at 2.0 eV. Assuming propagation of the two different photoinduced metallic states, we could reproduce the time profiles as well as the magnitude in the reflectance change, indicating the fabrication of the photoinduced multilayered thin film in Pr_{0.5}Ca_{0.5}CoO_3.

Femtosecond Reflection Spectroscopy in La_{1.5}Sr_{0.5}CoO_4

100%

Egawa T., Okimoto Y., Fukaya R., Onda K., Ishikawa T., Koshihara S., Isayama A., Sasagawa T.

Acta Physica Polonica A

2012

vol. 121

issue 2

307-309

Ultrafast optical response has been investigated using fs laser system on a perovskite-type cobalt oxide, La_{1.5}Sr_{0.5}CoO_4. After the photoirradiation at room temperature, the time profile of relative change of reflectance (Δ R/R) shows a sudden change within the pulse duration ( ≈ 150 fs) and decays with a lifetime of ≈ 330 fs. The sign of Δ R/R after the photoexcitation is positive in the mid-infrared region (at 0.50 eV) while negative in the visible energy region (at 2.0 eV), implying photoinduced change of the electronic structure after the photoexcitation.

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2 Acta Physica Polonica A

2 2012

2 Egawa T.

2 Fukaya R.

2 Ishikawa T.

2 Koshihara S.

2 Okimoto Y.

2 Onda K.

1 Isayama A.

1 Itoh M.

1 Kurashima M.

1 Kyomen T.

1 Sasagawa T.

1 Seko K.

Search results

Photoinduced Phase Transition in Pr_{0.5}Ca_{0.5}CoO_3 Studied by Sequential Pulse Excitations

Femtosecond Reflection Spectroscopy in La_{1.5}Sr_{0.5}CoO_4